He plays Lt. Cmdr. Harmon "Harm" Rabb, Jr.

He was born in Toronto, Canada. His birth date is September 21. Height 6'4". He is married Nanci Chambers in 1992 and they a daughter, Stephanie.
At 19, David was singing in a rock band when he read King Lear in a
theater history class and was encouraged to try his hand at acting.
He was accepted at Ryerson Polytechnic Institute (a Canadian arts
college equivalent to Juilliard) in 1983, then attended the Stratford
Shakespeare Festival in Ontario, where he won the Jean Chalmers
award for Most Promising Actor. In 1990, David moved to Los Angeles and was signed to a
development deal with Disney.

He starred in the CBC series, Street Legal, from 1985 to 1988 as Nick.
Doogie Howser, M.D., China Beach, The Hitchhiker, and Dark Justice.
In 1992, he landed a recurring role as a
pro-baseball player in the long-running hit CBS series Knots Landing,
and later that year starred in the syndicated series The
Untouchables. David James Elliott, who played Terry Parson in Melrose Place,
and Seinfeld as Carl the moving guy.
He recently completed the independent film Clockwatchers, with Parker Posey and Lisa Kudrow.

She plays Marine Major Sarah "Mac" MacKenzie.

She was born in London and moved to Los Angeles with her mother
when she was three years old. Her birth date is August 14. She is married.She speaks fluent Farsi, the language of her grandparents.

She began her career as an actress by accident. During her college
years at UCLA, she modeled part-time while studying to be either a
doctor or a biomedical engineer. Her studies were interrupted when
she was offered an assignment to model for several months in Japan.
Although her modeling career was flourishing, Catherine felt
hampered by her shyness, so she hired an acting coach and was
immediately bitten by the acting bug.

Catherine Bell made a brief appearance on JAG two seasons ago as
a Navy lieutenant who was murdered (episode Skeleton Crew as Lt. Dianne Schonke) , and series executive producer and creator Donald Bellisario was so impressed by her performance
that he cast her as the female lead when the series moved to CBS.

She starred film as Crash Dive is On, Crash Dive, Alien Nation: Body and Soul, Men of War, Mother of the Bride, Death Becomes Her. Her television credits include appearances in Hot Line, Dream On, Friends and Hercules: The Legendary Journeys.

She plays Lt. (j.g.) Meg Austin

She was born in Dallas, Texas. Her birth date is March 28. Height 5' 11". She is married Tommy Hinkley.

She is the only girl in a family of four children. Her father was a homebuilder. When she was 8 her family moved to Denver and her father's work dictated that the family move back and forth between the two cities.
After her high-school graduation, Tracey traveled through Europe and Australia. In 1988, she went to Los
Angeles to study acting and audition for roles. She made her TV acting debut on "Jake and the Fatman".
She starred film as Last Stand at Saber River, Bonnie & Clyde: The True Story, Buried Alive 2, Lush Life, Sensation, Prophet of Evil:The Evil LeBaron Story, 919 Fifth Avenue. Her TV Series credits include in Life Goes On, VR.5 and actually she is on show Total Security as Ellie Jones.

He plays Lt. (j.g.) Bud Roberts.

His birth date is July 22. He is single.

Patrick Labyorteaux began his show business career at the age of
three in a local stage play in Hollywood.
Patrick and his brother, actor Matthew Labyorteaux, founded the
Youth Rescue Fund, a charity dedicated to helping runaways. In
1982, Patrick went before a House subcommittee to plead the case
of runaways and raised $11 million for youth shelters across
America.

He had a co-starring role in the pilot episode of JAG, and executive
producer Donald Bellisario liked the comic relief his character
provided so much that he decided to bring Patrick back as a series
regular.

He went on to appear in films such as Mame (as the grandnephew of Lucille Ball's character),
Opening Night, Heathers, Summer School, Ski School, and 3 Ninjas.
On television he was a regular in the series Little House on the
Prairie and The Last Frontier. He also appeared in Lois and Clark:
The New Adventures of Superman, Too Something, Hope and Gloria,
and Living Single.

He plays Adm. A J Chegwidden

His birth date is June 1. He coaches Pony baseball in his spare time.
John M. Jackson's television credits include guest-starring roles in
the CBS series Northern Exposure, Sisters; Party of Five; and Dark
Skies: The Awakening.

He had a recurring role in Wiseguy, also on CBS. His television
movie credits include Memory of Evil, The Deception, Roswell, Black
Widow Murders, Shattered Vows, Switched at Birth, Adam, Family of
Spies (in which he also played a naval officer), and Blind Justice.

His theatrical film credits include Glimmer Man, The Spitfire Grill, A
Perfect World, A Few Good Men, The Legend of Billie Jean, and
Local Hero.

On stage, John has performed in regional productions of A Voice in
the Theatre, Four Corners, and Are You Now or Have You Ever
Been?

She plays Cmdr. Allison Krennick.

She was born in Dayton, Ohio in 1962 .Height 5' 8". She is divorced and she has a son, Al

She has four siblings and was raised in a strict Catholic household. At the age of six she moved to Australia with her family. After graduating from high school Andrea traveled the world for five years before moving to New York to study acting. She then went to Hollywood and eventually got her first small part in Wall Street.